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42 cm = 2(p+l)
(p+l) = 42/2
(p+l) = 21
dik = p : l = 4 : 3
p = 4/(4+3) x 21 = 4/7 x 21 = 4 x 3 = 12 cm
l = 3/7 x 21 = 3 x 3 = 9 cm